acheiropoieton
A religion icon (chiefly of Christ or the Virgin Mary) believed not to have been created by human hands; a miraculous image.
These legends not only established the value of the Mandylion and the Vera Icon as authentic portraits of Christ, but also as acheiropoieta, i.e., images made without the intervention of human hands.
Where it comes from
From Byzantine Greek ἀχειροποίητον (akheiropoíēton), from ἀ- (a-, “a-, the alpha privative”) + χείρ (kheír, “hand”) + ποιεῖν (poieîn, “to make”).
Adapted from the Wiktionary entry acheiropoieton (CC BY-SA 4.0).